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mux_types.h

// Copyright 2012 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
// -----------------------------------------------------------------------------
//
// Data-types common to the mux and demux libraries.
//
// Author: Urvang (urvang@google.com)

#ifndef WEBP_WEBP_MUX_TYPES_H_
#define WEBP_WEBP_MUX_TYPES_H_

#include <stdlib.h>  // free()
#include <string.h>  // memset()
#include "./types.h"

#ifdef __cplusplus
extern "C" {
#endif

// Note: forward declaring enumerations is not allowed in (strict) C and C++,
// the types are left here for reference.
// typedef enum WebPFeatureFlags WebPFeatureFlags;
// typedef enum WebPMuxAnimDispose WebPMuxAnimDispose;
// typedef enum WebPMuxAnimBlend WebPMuxAnimBlend;
typedef struct WebPData WebPData;

// VP8X Feature Flags.
typedef enum WebPFeatureFlags {
  ANIMATION_FLAG  = 0x00000002,
  XMP_FLAG        = 0x00000004,
  EXIF_FLAG       = 0x00000008,
  ALPHA_FLAG      = 0x00000010,
  ICCP_FLAG       = 0x00000020,

ALL_VALID_FLAGS = 0x0000003e
} WebPFeatureFlags;

// Dispose method (animation only). Indicates how the area used by the current
// frame is to be treated before rendering the next frame on the canvas.
typedef enum WebPMuxAnimDispose {
  WEBP_MUX_DISPOSE_NONE,       // Do not dispose.
  WEBP_MUX_DISPOSE_BACKGROUND  // Dispose to background color.
} WebPMuxAnimDispose;

// Blend operation (animation only). Indicates how transparent pixels of the
// current frame are blended with those of the previous canvas.
typedef enum WebPMuxAnimBlend {
  WEBP_MUX_BLEND,              // Blend.
  WEBP_MUX_NO_BLEND            // Do not blend.
} WebPMuxAnimBlend;

// Data type used to describe 'raw' data, e.g., chunk data
// (ICC profile, metadata) and WebP compressed image data.
struct WebPData {
  const uint8_t* bytes;
  size_t size;
};

// Initializes the contents of the 'webp_data' object with default values.
static WEBP_INLINE void WebPDataInit(WebPData* webp_data) {
  if (webp_data != NULL) {
    memset(webp_data, 0, sizeof(*webp_data));
  }
}

// Clears the contents of the 'webp_data' object by calling free(). Does not
// deallocate the object itself.
static WEBP_INLINE void WebPDataClear(WebPData* webp_data) {
  if (webp_data != NULL) {
    free((void*)webp_data->bytes);
    WebPDataInit(webp_data);
  }
}

// Allocates necessary storage for 'dst' and copies the contents of 'src'.
// Returns true on success.
static WEBP_INLINE int WebPDataCopy(const WebPData* src, WebPData* dst) {
  if (src == NULL || dst == NULL) return 0;
  WebPDataInit(dst);
  if (src->bytes != NULL && src->size != 0) {
    dst->bytes = (uint8_t*)malloc(src->size);
    if (dst->bytes == NULL) return 0;
    memcpy((void*)dst->bytes, src->bytes, src->size);
    dst->size = src->size;
  }
  return 1;
}

#ifdef __cplusplus
}    // extern "C"
#endif

#endif  /* WEBP_WEBP_MUX_TYPES_H_ */

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	drwxr-xr-x	2024-03-03 11:04:38
..	dir	-	root/root	drwxr-xr-x	2024-11-16 06:02:22
decode.h	text/x-c	22.61 KB	root/root	-rw-r--r--	2018-04-21 03:04:55
demux.h	text/x-c	15.24 KB	root/root	-rw-r--r--	2018-04-21 03:04:55
encode.h	text/x-c	26.84 KB	root/root	-rw-r--r--	2018-04-21 03:04:55
mux.h	text/x-c	22.29 KB	root/root	-rw-r--r--	2018-04-21 03:04:55
mux_types.h	text/x-c	3.08 KB	root/root	-rw-r--r--	2018-04-21 03:04:55
types.h	text/x-c	1.63 KB	root/root	-rw-r--r--	2018-04-21 03:04:55